Select all of the accurate statements below. A. The chromosomes and plasmids in
ID: 181190 • Letter: S
Question
Select all of the accurate statements below.
A. The chromosomes and plasmids in bacteria, archaea, and eukaryotes contain double-stranded DNA.
B. Most bacteria and archaea have circular DNA in the cytoplasm, while most eukaryotes have linear DNA in the nucleus.
C. Archea have histone proteins associated with their DNA, while bacteria do not have histones.
D. All of the DNA in eukaryotic cells is contained within a nucleus.
A. The chromosomes and plasmids in bacteria, archaea, and eukaryotes contain double-stranded DNA.
B. Most bacteria and archaea have circular DNA in the cytoplasm, while most eukaryotes have linear DNA in the nucleus.
C. Archea have histone proteins associated with their DNA, while bacteria do not have histones.
D. All of the DNA in eukaryotic cells is contained within a nucleus.
Explanation / Answer
Statement A is not true. Chromosomes and plasmids in bacteria and archaea contain single stranded DNA, not double stranded.
Statement B is true. Most bacteria and archaea have covalently closed circular DNA in the cytoplasm. Their nucleus is not membrane enclosed. Whereas, most eukaryotes have linear DNA (chromosomes) enclosed in the nucleus.
Statement C is also true. Histones are highly alkaline proteins that package and order the DNA into structural units called nucleosomes. Archaea has histone proteins associated with their DNA while bacteria do not have histones. In this way, archaea are more similar to eukaryotes.
Statement D is false (not true). All the eukaryotic DNA is not located within the nucleus. Eukaryotes also have a small portion of DNA as mitochondrial DNA (DNA present in mitochondria (mtDNA), an organelle involved in convertion of chemical energy from food into ATP).
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